What is one way to detect a counterfeit bill?

Detecting a counterfeit bill effectively can often involve assessing specific security features that authentic currency possesses, one of which is the watermark. A watermark is a recognizable image or design embedded into the paper during its manufacturing. When you hold a genuine bill up to the light, this watermark should appear as a light and dark contrast, often showing a portrait or another important symbol. Counterfeit bills typically lack this feature, and if they do have a watermark, it may not match the authentic bill's specifications.

Other methods of detection, while they have their merits, may not be as reliable on their own. For example, checking the color of the bill might indicate counterfeit if the hues are off, but some counterfeits can closely mimic the color of genuine bills. Weighing the bill for accuracy might provide some insight, but the weight alone can be tricky since counterfeiters may use paper of similar weight. Feeling for rough edges can also be helpful, but modern printing techniques allow some counterfeit bills to reproduce smooth finishes effectively. Thus, recognizing the presence and characteristics of a watermark stands out as a solid means of verifying the authenticity of currency.